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Ixiasoft
4.3.6. The FMC Tab
This tab allows you to perform loopback tests on the FMC port.
Figure 11. The FMC Tab
The following sections describe controls in the FMC tab.
Status
Displays the following status information during a loopback test:
- PLL Lock: Shows the PLL locked or unlocked state.
- Pattern Sync: Shows the pattern synced or not synced state. The pattern is considered synced when the start of he data data sequence is detected.
- Details: Shows the PLL lock, pattern sync status and number of errors per channel.
Port
Allows you to specify the interface to test. The following port are available to test:
- XCVR
- CMOS
PMA Settings
Allows you to make changes to the PMA parameters that affect the active transceiver interface. The following settings are available for analysis:
- Serial Loopback: Routes signals between the transmitter and receiver.
- VOD: Specifies the voltage output differential of the transmitter buffer.
- Pre-emphasis tap:
- 1st pre: Specifies the amount of pre-emphasis on the pre-tap of the transmitter buffer.
- 2nd pre: Specifies the amount of pre-emphasis on the second pre-tap of the transmitter buffer.
- 1st post: Specifies the amount of pre-emphasis on the first post tap of the transmitter buffer.
- 2nd post: Specifies the amount of pre-emphasis on the second post tap of the transmitter buffer.
- Equalizer: Specifies the AC gain setting for the receiver equalizer in four stage mode.
- DC gain: Specifies the DC gain setting for the receiver equalizer in four stage mode.
- VGA: Specifies the VGA gain value.
Figure 12. PMA Settings
Data Type
Specifies the type of data contained in the transactions. The following data types are available for analysis.
- PRBS 7: Selects pseudo-random 7-bit sequences
- PRBS 15: Selects pseudo-random 15-bit sequences
- PRBS 23: Selects pseudo-random 23-bit sequences
- PRBS 31: Selects pseudo-random 31-bit sequences
- high_freq: Selects highest frequency divide-by-2 data pattern 10101010
- low_freq: Selects lowest frequency divide-by-33 data pattern
Error Control
Displays data errors detected during analysis and allows you to insert erros:
- Detected errors: Displays the number of data errors detected in the hardware.
- Inserted errors: Displays the number of errors inserted into the transmit data stream.
- Insert Error: Inserts a one-word error into the transmit data stream each time you click the button. Insert Error is only enabled during transaction performance analysis.
- Clear: Resets the Detected error and Inserted error counters to zeroes.
Run Control
Start: Initiates the selected ports transaction performance analysis.
Note: Always click Clear before Start.
Stop: Terminates transaction performance analysis.
TX and RX performance bars: Shows the percentage of maximum theoretical data rate that the requested transactions are able to achieve.